In the prior year, Zukertort, Inc. had current assets of $$6200,$ fixed assets of $$49,300,$ current liabilities of $$5700,$ and long$-$term debt of $$18,100.$ In the prior year, Zukertort has $$101,000$ in sales, $$66000$ in COGS, $$23000$ in SGA, $$2200$ in depreciation expense, $$1600$ in interest expense, paid $$4100$ in dividends, and realized a $21\%$ tax rate. This year, current assets are $$6500$ and current liabilities are $$5900\mathrm{.}1-$ Assuming that all liabilities are debt, what is the debt to equity ratio? $2-$What is the change in net working capital? $($in dollars$)3-$What is the sustainable growth rate? $($percentage$)4-$What is the book value of owner's equity? $($in dollars$)5-$What is the operating cash flow? $($in dollars$)6-$What is the ROE? $($percentage$)$